Diestock



l. W. NONNEMAN.

DIESTOCK.

APPLICATION FILED SUT. I6, 1918.

I. W. NONNEMAN.

DIESTOCK.

APPLICATION FILED SEPT. I6, |918.

1,338,863. I Patented May 4, 1920.

2 SHEETS-SHEET 2.

' ZN VENTO@ /7 Waar/5m UNITED STATESA PATENT OFFICE.

IRA W. NONNEIVIAN, OF WARREN, OHIO, ASSIGNORTO THE BORDEN COMPANY, OF WARREN, OIIIO7 A CORPORATION OF OHIO.

DIEs'roCK.

"Specification of Letters Patent.

Patented May 4, 1920.

To all whom it may concern:

Be it known that I, IRA W. NONNEMAN, a citizen of the United States, residing at lVarren, in the county of Trumbull and State of Ohio, have invented a certain new and useful Improvement q in Diestocks, of which the following is a full, clear, and eX- act description, reference being had to the accompanying drawings.

This invention relates to a simple and cheap die stock having means permitting the thread cutting chasers. to properlyrecede from the pipe as the threading progresses. vThe object is to provide a very simple structure by which the die stock may be readily guided on the pipe and the recedence of the chasers effectively accomplished. To this end I provide a chaser carrying frame, a movable sleeve having a tapered engagement with shoulders on the chasers and ak device carried by the sleeve and adapted to engage the interior of the pipe being threaded and at once provide a guide for the die stock and an abutment holding the sleeve against longitudinal progress, so that the chaser will be allowed to recede as the threading takes place.

An approved embodiment of my invention is illustrated in the drawings hereof and is hereinafter morefully explained and the essential characteristics are summarized in the claims.

In the drawings, Figure 1 is an end or face View of the die stock; Fig. 2 is a side elevation of such die stock; Fig. 3 is an elevation from the opposite direction from Fig. 1, being a section through the pipe being threaded; Fig. 4 is a longitudinal sec tion through the die stock and pipe, pn the angular planes indicated by the line 4 4 on Fig. 3; Fig. 5 is a perspective view of one of the chasers employed.

As shown in Figs. 1 to 4, 10 indicates a chaser carrying frame consisting of a flat ring-like portion 11, bosses 12 carried thereby and radially slotted to accommodate the chasers and a cylindrical extension 13. Secured to the face ofthe bosses are plates 15 and in the rectangular housings thus provided are the radial chasers 20. The frame is provided with integral diametrically opposed sockets 18 into which are screw threaded the usual operating handles 30.

40 indicates a cup-like bushing having a portion 42, with a cylindrical exterior occupying the bore 16 of the chaser carrying frame. The cylindrical member 42 is internally tapered corresponding to the taper of the thread to be cut. The chasers 2() cX- tend through notches 44 in this controlling sleeve. Each chaser has jin its side a notch 21 with an inclined inner wall 22 of the same taper as the sleeve 42. of this sleeve adjacent to the notch occupies the grooves 21 of the different chasers'.

It results from the construction described that the sleeve 42 forms.- an abutment member limiting the outward movement ofthe chasers, while if this sleeve is drawn longitudinally out of the chaser carrying frame, it will permit the chasers to move'outward radially, thus providing for the tapered thread desired. To effect such movement of the sleeve automatically, I provide the abutment member 50. This is a cup-like member swiveled to the member 40 by means of an axial cap-screw 51 extending through the member 40 andl into the member 50. The member 50 has a cylindrical extension 52, a portion of which is of reduced diameter. Thisv reduced portion is adapted to Atit with reasonable snugness the interior of a pipe Vbeing threaded, as the pipe A in Figs. 3 and 4,7and thereby guide the die stock. The shoulder-153 where the reduced portion of the sleeve terminates is adapted to form an abutment' against the; end of the pipe A and stop the abutment bushing 40.

In the use of my die stock, the sleeve 52 is inserted within the end of the pipe A= to be threaded, and the frame and chasers are rotated. The sleeve 52 serves to guide the die stock and properly present the chasers to the pipe. After the threading is continued to the point where the chasers should recede, the shoulder 53 abuts the end of the pipe A as .shown in Fig, 4. Then as the rotation of the die stock continues, the abutment bushing 40 continues to rotate about the screw 51 but can 'not travel with the chaser carrying frame and therefore the latter draws oil of this. abutment. sleeve." This releases the chasers so that they move relatively outward as allowed by the taper of the sleeve 42.

It will be seen that my die stock is very simple in construction but readily accom- The body plishes Vthe combined result of properly guiding the die stock and insuring thev pro )er Withdrawal of the chasers.

I aving thus described my invention, What I claim is:

l. In a die stock, the combination of al rotary frame, a cup-shaped bushing having its Wall occupying the interior of the frame, said Wall being internally tapered, chasers carried by the frame engaged by said tapered portion, and a member having a cylindrical sleeve portion adapted to engage the interior of a pipe and a larger Y portion adapted to abut the end of the pipe and a head adapted to stand adjacent to the headv of said cup-shaped bushing, and means for connecting the tivo heads by a swivel at the axis of the die stock.

2. In a die stock, the combination of a frame having a bore, chasers carried by the frame extending into the bore, a bushing occupying the frame having longitudinal slots extending from one end, said bushing having a tapered interior, and said chasers occupying the slots and tapered shoulders engaged by tapered material of the bushing at the corresponding edge of the slots, and means for causing said bushing to shift in the Chaser frame as the threading pro-v chasers occupying said housings, a sleeve occupying such bore having openings for the passage or' the chasers, and having tapered inner edges adapted to engageV tagered shoulders on the chasers, said sleeve having a portion extending across the end oi: the pipe, and a member axially swiveled to said extending portion of tl e sleeve and having a guidingV portion adapted to engage the interior of the pipe.

6. In a die stock, the combination or' a rotary frame having radial Chaser housings and having an internal bore adapted to surround a pipe at some distance from it, radial chasers occupyingsaid housings and adapted at their inner ends to engage the pipe, a sleeve occupying such bore and having openings or the passage of the chasers and having tapered inner edges adapted to engage tapered shoulders on the chasers, said sleeve having a portion extending across the end of the pipe, and a member having a cylindrical sleeve portion adapted to engage the interior of a pipe and a larger portion adapted to abut the end of the pipe and a iead adapted to stand adjacent to the head of said sleeve, and means 'for connecting the two heads by a swivel at the axis of the die stock.

In testimony whereof I hereunto afdx my signature.

IRA W. NONNEMAN. 

